相关实验视频
Updated: Jul 8, 2025

07:13
3D Modeling of Dendritic Spines with Synaptic Plasticity
Published on: May 18, 2020
6.9K
合作性,信息获取和能源成本在树突脊柱早期的LTP期间
Jan Karbowski1, Paulina Urban2,3
1Institute of Applied Mathematics and Mechanics, University of Warsaw, Warsaw 02-097, Poland jkarbowski@mimuw.edu.pl.
Neural computation
|December 15, 2023
概括
学习比记忆需要更多的能量. 信息和能量在刺激期间达到峰值,然后下降,与持久的记忆痕迹不同. 突触聚类增强了每个能量成本的内存持续时间.
科学领域:
- 神经科学是一个神经科学.
- 计算神经科学是一种神经科学.
- 统计物理 统计物理
背景情况:
- 长期增强 (LTP) 对学习和记忆至关重要.
- 了解突触可塑性的能量成本和信息动态是必不可少的.
- 大规模神经系统中的状脊柱相互作用是复杂且具有计算挑战性的.
研究的目的:
- 研究LTP诱导和维护期间信息和能量之间的关系.
- 使用随机热力学分析结合的树突的动力学.
- 探索突触相关性和稀疏表示如何影响记忆效率和能量成本.
主要方法:
- 开发了一种对近似来简化一个计算难以处理的树突的随机多维系统.
- 应用非平衡的随机热力学来建模脊柱动力学.
- 分析了不同突触合作和刺激分数下的信息获取,能量成本,记忆持续时间和效率.
主要成果:
- 信息获取和能量速率在LTP刺激期间达到峰值,然后下降,而记忆痕迹仍然存在.
- 学习比记忆巩固要耗费更多的能量.
- 脊柱之间的正相关性提高了记忆持续时间和能量成本,在高合作率下,记忆时间每能量显著增加.
- 负相关性最大化了LTP后的信息获取,但效率随着合作性而下降.
- 稀疏表示 (低刺激突触分数) 最大限度地提高了长期信息编码的能量和结构效率.
结论:
- 在LTP的早期阶段,信息处理需要大量的能量.
- 突触集群可以对相对于能量消耗的记忆持续时间有益.
- 稀疏的编码策略是有效的长期记忆储存在树突状脊柱.
- 随机热力学为理解突触可塑性中的信息编码和能量成本提供了一个统一的框架.
相关概念视频
Long-term Potentiation
2.8K
Long-term potentiation, or LTP, is one of the ways by which synaptic plasticity—changes in the strength of chemical synapses—can occur in the brain. LTP is the process of synaptic strengthening that occurs over time between pre and postsynaptic neuronal connections. The synaptic strengthening of LTP works in opposition to the synaptic weakening of long-term depression (LTD) and together are the main mechanisms that underlie learning and memory.
Hebbian LTP
LTP can occur when...
Hebbian LTP
LTP can occur when...
2.8K
Integration of Synaptic Events
1.5K
Synaptic integration mainly includes the summation of graded potentials. Graded potentials, regardless of their type, cause subtle alterations in membrane voltage, resulting in either depolarization or hyperpolarization. These incremental changes, when combined or summed, can propel the neuron toward its threshold. Consider, for example, a membrane experiencing a +15 mV shift, causing it to depolarize from -70 mV to -55 mV. In this scenario, graded potentials govern the membrane's ability to...
1.5K
Cooperative Allosteric Transitions
7.9K
Cooperative allosteric transitions can occur in multimeric proteins, where each subunit of the protein has its own ligand-binding site. When a ligand binds to any of these subunits, it triggers a conformational change that affects the binding sites in the other subunits; this can change the affinity of the other sites for their respective ligands. The ability of the protein to change the shape of its binding site is attributed to the presence of a mix of flexible and stable segments in the...
7.9K
Excitatory and Inhibitory Effects of Neurotransmitters
10.0K
When an action potential reaches the presynaptic axon terminal, it releases neurotransmitters from the neuron into the synaptic cleft at a chemical synapse. The released neurotransmitter can be excitatory or inhibitory. The critical criteria commonly used to determine whether a molecule is a neurotransmitter at a chemical synapse are the molecule's presence in the presynaptic neuron. Second, its release is in response to strong presynaptic depolarization. And lastly, the presence of...
10.0K
Long-term Depression
30.9K
Long-term depression, or LTD, is one of the ways by which synaptic plasticity—changes in the strength of chemical synapses—can occur in the brain. LTD is the process of synaptic weakening that occurs over time between pre and postsynaptic neuronal connections. The synaptic weakening of LTD works in opposition to synaptic strengthening by long-term potentiation (LTP) and together are the main mechanisms that underlie learning and memory.
30.9K
Postsynaptic Potential (PSP)
2.6K
Postsynaptic potential (PSP) refers to a change in the electrical potential of a neuron when neurotransmitters released by presynaptic neurons bind to postsynaptic receptors. This potential can either be excitatory, leading to depolarization and ultimately action potential generation, or inhibitory, leading to hyperpolarization and suppression of the postsynaptic neuron.
There are two types of receptors: ionotropic and metabotropic.
The ionotropic receptor is the membrane protein that has an...
There are two types of receptors: ionotropic and metabotropic.
The ionotropic receptor is the membrane protein that has an...
2.6K

